Publicité
Les langues disponibles
Les langues disponibles
Replacing The Spark Plug
Use a Champion RDJ7Y spark plug (or equivalent).
Correct air gap is 0.020 in (0.5 mm). Remove plug
after every 50 hours of operation and check its
condition.
1.
Stop engine and wait for all moving parts to
stop. Pull wire off spark plug.
2.
Clean around the spark plug and remove it from
the cylinder head.
Note:
Replace a cracked, fouled or dirty
spark plug. Do not sand blast, scrape
or clean electrodes because the engine
could be damaged by grit entering the
cylinder.
3.
Set the air gap at 0.020 in (0.5 mm) using a wire
feeler gauge (Fig. 31). Install a correctly gapped
spark plug into the cylinder head. Torque to
110-120 in lb (12.3-13.5 N m).
Inspecting/Cleaning The
Muffler
The muffler should be removed every 25 hours of
operation to inspect for excessive carbon build-up.
Excessive deposits around the exhaust port will cause
poor engine performance.
To remove the muffler from the N28 engine, the rear
engine cover and fuel tank assembly must be
disassembled. Use the following instructions to
disassemble these parts.
Note:
You will need new muffler and exhaust
exit tube gaskets.
POTENTIAL HAZARD
Muffler surface becomes hot when trimmer
is in operation and remains hot for some
time after the engine is shut off.
WHAT CAN HAPPEN
Contact with hot muffler surfaces could
cause a burn.
HOW TO AVOID THE HAZARD
Make sure the muffler is cool before
inspecting and cleaning it.
Removing The Rear Engine Cover
1.
Remove the two (2) screws securing the rear
cover to the starter housing and crankcase
(Fig. 32). Remove the rear engine cover.
Removing The Fuel Tank Bracket, Fuel
Tank, And Heat Shield
1.
Drain fuel from fuel tank.
2.
Remove the two (2) screws from the fuel tank
bracket.
3.
Remove the bracket, fuel tank, and heat shield
(Fig. 33).
Removing The Muffler
1.
Remove the muffler mounting bolts (Fig. 34).
2.
Remove the muffler (with heat shield) and
gasket. Discard the old gasket.
Removing The Exhaust Exit Tube
1.
Remove the screws securing the exhaust exit
tube to the muffler body (Fig. 35).
EN–14
Publicité
